Upon investigating the current amount of dangerous criminals being incarcerated in a standard first/second world country, how do we manage to get enough D personnel, assuming they are all from the region's penitentiaries, without framing people? Do we steal hobos? Volunteer Ds? I really can't tell.

Also, it might be a smarter idea to change policy to exterminating only D personnel exposed to "highly dangerous, transformative, and infectious that may or may not have dangerous effects if cross-contaminated". More cost/worker-efficient.

I agree that it seems to be a terrible waste to spend all this time training them in proper laboratory procedure and safety protocols every month, and it might be better to have D-classes upgraded to "expendable" and create a new sub-D-class that undergo mandatory retirement, as it were, but there's far too much reference in the material to justify doing it.

But just looking at the vast numbers of death-row inmates we need to conscript every month, it doesn't seem practical.

It's not a question of whether they'll talk or not, it's a question of human resources. According to this page, only 37 people were executed last year in the United States. Thirty-seven, and I dare you to go through the list and count up all the prisoners who have to be shot every month. Even taking part-time duties into account, there aren't enough vanishable people to do all those hazardous jobs every month.

But hey, this is the SCP Foundation. We've dealt with things that more directly violate reality, right?

It does help that they are around only for Keter-level objects or possibly dangerous investigations, and even of Keter-level SCPs, a number are just aren't interacted with at all, another number seem to avoid keter-level requirements (Able, for example), or only use D-class folk for research purposes with general observation being run by normal researchers (SCP-670). It might be best to use the general horror of realizing that the Foundation probably is scooping up innocent people, rather than the practical purpose of it.

Probably the MST mantra applies here, but the whole "D-Class" thing has always struck me as a major plothole. How exactly is the Foundation supposed to maintain its secrecy while simultaneously "disappearing" huge numbers of people from the prison system? Even those few prisoners with no family or friends still have civil rights and anti-death penalty groups looking out for them. You'd think someone would have noticed by now…

Frankly, if the Foundation was ruthless enough, it'd be far easier to just snatch some poor schlubs off the streets than out of prisons.

But the SCP in question produces humans that are also copies of what's inside as well? So, if we get a homicidal maniac prisoner (you know, a quiet, nonassuming type), then we might get a clone who does the same as well.

Besides, what would happen if some of those NATO soldiers found out? In my opinion, it's bad enough that we use it, but, if a soldier somehow got wind of it? You can't do things perfectly, you know. Besides, what's a death row inmate gonna do with his time? Time that is slowly/surely running out?